Steam-valve



(No Model.)

W. 0. MQKI'NNIS.

' I STEAM VALVE. I No. 312,488. Patented Pei). 17,1885.

. UNITED STATES Price,

PATENT STEAM -VALVE.

SPECIFICATION forming part of Letters Patent No. 312,488, datedPebruary17, 1885.

Y A plication filed September 1, 1884. (No model.)

To all whom it may concern/.-

Be it known that LWILLIAM C. McKrNNIs,

a citizen of the United States, residing at Red Bluff, in the county ofJefferson and State of Arkansas, have invented certain new and usefulImprovements in Steam-Valves, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention pertains to improvements in slide-valves forsteamengines, having for its object, among other things, to reducefriction to a minimum, to effect the adjustment of the parts, to take upor compensate wear, and to promote simplicity of construction; and theinvention consists of the combination and disposition of parts,substantially as hereinafter more fully set forth and claimed. In theaccompanying drawings, Figure 1 is a horizontal section of my improvedslidevalve. Fig. 2 isa longitudinal section thereof. Fig. 3 is a crosssection of the same.

In the embodiment of my invention I employ a valve, A, and steam-chestA, whose ends are close'd save where the valve-stem passes through it toexclude from the valve chamber dirt or other foreign substances. Thechest A is subdivided into the valvechamber a and the steam-chamber a,the lat ter communicating with said valvechamber by openings a made inthe dividing plate or partition (0 between said chambers. The normallylower longitudinal edges of the steamchest A are provided with flangesb, which are connected to the cylinder-plated by screws e e at thecorners, which plate, inside of the chest, is thickened up to form thevalve-seat B, having steam-ports ff through it.

Intermediately of the screws 0 are passed 40 through the flanges b,additional adjusting- I screws, 0 e, which do not, however, pass Ithrough the cylinderplate d, but hear thereon, and are turned in theopposite direction to that in which the fasteningserews e e are turned,whereby it will be observed that with the valve seated upon the elevatedor thickened upseat B,(permitting the lower edgeflanges of the chest Ato normally stand ofl from the cylinder-plate,) upon the wearing away ofthe vahe and its seat said wear can be readily compensated, the screws 6being screws 6 are turned in reverse direction. The valve A is disposedin the chamber a of the steam-chest A, and is provided with the usualstem, g. The valveA is provided with livesteam ports h h and theintermediate exhauststeam port, it. Said live-steam ports are arrangedwell toward the ends of the valve, while in one side of the valve (thatside next to the cylinder-plate or cylinder) said exhaust-steam port isof such length that when one of the live-steam ports is admitting steamto one side of the piston of said cylinder that end of the exhaust steamport most distant from said livest-eam port will be exhausting into acentral pipe, t, arranged to extend vertically through the chamber a ofthe chest A; or it chamber a, from which the exhaust-steam may bedischarged through 'a pipe leading to a point below. Either a 1011 g orshort valve may be employed without affecting the action of the parts orincreasing the friction, the 1) ms being widened in the use of a shortervalve, and elongated when the reverse is the case. This valve is simplein construction and can be used at the side as well as the bottom of thechest, as in the present instance. It can also be used in practice withmetallic orsteel-spring packing. a

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. The chest A, subdivided into valve-chain her a and steam-chamber a,having the flange bconnected to plate (I by screws 0, and adjusting-screws e'c, substantially as shown, and for the purposedescribed.

2. In a steam-valve, the plate (I, having integral therewith valveseat Band steanrports ff, in combination with the chest A, having flange b,and screws 0 and e c, substantially as shown and described.

In testimony whereof I aiiix niysignature in presence of two witnesses.

his GEO. MA'rHnR.

in a rk tightened or turned to the right, while the may in practiceexhaust directly into said

